Great bustard  (Otis tarda)

Lek: System of mating in which males display collectively in an area known as a lek. Males compete for the best sites within the lek and females then choose whom to mate with on the basis of the display.

1. IUCN Red List (November, 2004)
   http://www.iucnredlist.org
   
2. BirdLife International (November, 2004)
   http://www.birdlife.org/datazone/search/species_search.html?action=SpcHTMDetails.asp&sid=2760&m=0
   
3. CITES (November, 2004)
   http://www.cites.org
   
4. CMS (November, 2004)
   http://www.cms.int/species/otis_tarda/meetings/GB_1/pdf/Inf_04_2_NationalReport_Albania.pdf
   
5. Dawes, A. (May, 2008) Pers. Comm.
   
6. BirdLife International. (2001) Threatened Birds of Asia: the BirdLife International Red Data Book. BirdLife International, Cambridge, UK.